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Add port of FreeBSD 'volmode' property

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The volmode property may be set to control the visibility of ZVOL
block devices.

This allow switching ZVOL between three modes:
   full - existing fully functional behaviour (default)
   dev  - hide partitions on ZVOL block devices
   none - not exposing volumes outside ZFS

Additionally the new zvol_volmode module parameter can be used to
control the default behaviour.

This functionality can be used, for instance, on "backup" pools to
avoid cluttering /dev with unneeded zd* devices.

Original-patch-by: mav <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: loli10K <ezomori.nozomu@gmail.com>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>

FreeBSD-commit: https://github.com/freebsd/freebsd/commit/dd28e6bb
Closes #1796 
Closes #3438 
Closes #6233
This commit is contained in:
LOLi
2017-07-12 22:05:37 +02:00
committed by Brian Behlendorf
parent e19572e4cc
commit cf8738d853
14 changed files with 634 additions and 83 deletions
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man/man5/zfs-module-parameters.5
+12
View File
@@ -2076,6 +2076,18 @@ Max number of threads which can handle zvol I/O requests concurrently.
Default value: \fB32\fR.
.RE
.sp
.ne 2
.na
\fBzvol_volmode\fR (uint)
.ad
.RS 12n
Defines zvol block devices behaviour when \fBvolmode\fR is set to \fBdefault\fR.
Valid values are \fB1\fR (full), \fB2\fR (dev) and \fB3\fR (none).
.sp
Default value: \fB1\fR.
.RE
.sp
.ne 2
.na